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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A081290 a(0) = 0, and for n >=1, a(n) = the largest Catalan number <= n.

Table of values

n a(n)
0 0
1 1
2 2
3 2
4 2
5 5
6 5
7 5
8 5
9 5
10 5
11 5
12 5
13 5
14 14
15 14
16 14
17 14
18 14
19 14
20 14
21 14
22 14
23 14
24 14
25 14
26 14
27 14
28 14
29 14
30 14
31 14
32 14
33 14
34 14
35 14
36 14
37 14
38 14
39 14
40 14
41 14
42 42
43 42
44 42
45 42
46 42
47 42
48 42
49 42
50 42
51 42
52 42
53 42
54 42
55 42
56 42
57 42
58 42
59 42
60 42
61 42
62 42
63 42
64 42
65 42
66 42
67 42
68 42
69 42
70 42
71 42
72 42
73 42

List of values

[0, 1, 2, 2, 2, 5, 5, 5, 5, 5, 5, 5, 5, 5, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42]

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